Harness-board for jacquabjd looms



UNITED sTATEs PATENT oEiucE.y

EDWARD EVERETT, OF LAWRENCE, AND SAML. T. THOMAS, OF LOWVELL,MASSACHUSETTS.

HARNESS-BOARD FOR JACQUARD LOOMS.

Specification of Letters Patent No. 9,545, dated January 18, 1853.

To all whom t may concern Be it known that we, EDWARD EVEEETT, ofLawrence, in the county of Essex and State of Massachusetts, and SAMUELT. THOMAS, of Lowell, in the county of Middlesex and State aforesaid,have invented an Improvement in Hole-Boards for Jacquard Looms; and wedo hereby declare that the following is a full, clear, and exactdescription of the construction and operation of the same, referencebeing had to the anneXed drawings, making a part of this speciication,in which- Figure I, is a plan or top view of the hole board; Figs. IIand III, side and end view of the notched bars; Fig. IV, end view of thehole board, in section; Fig. V, top view of one of the hole bars.

Our invention is designed to facilitate the operation of changing therelative position of the mail-cords or heddles in a J acquard loom, whenthe number of threads in a given breadth of the cloth is to be increasedor diminished, our improvement being confined to that part of the loomcommonly called the hole-board. Our improved hole-board occupies thesame place in the loom as the o-ne now in use, being secured in ahorizontal position between the lifting wires and the warp.

The hole-board heretofore used is simply a board of suitable length andbreadth, in which there are as many perforations as there are mail-cordsin the mounting. Each mail-cord is, in the Jacquard loom, attached atits upper end to the lifting wires, and thence passes through one of theperforations in the hole-board, below which it hangs in a verticalposition, suitable weigths being fastened to each co-rd just below thelevel of the warps. Suppose that there are eight hundred threads of warpin a breadth of thirty inches; if the weaver wishes to make a cloth ofthirty siX inches in width, and having the same number of threads he isobliged to substitute a hole board in which the holes are bored fartherapart. To do this he is compelled to unfasten every mailcord from itslifting-wire, and draw it doward through the hole-board. He then putsthe new hole board in place o-f the old one, draws each mail-cord upwardthrough its hole and attaches it to the proper lifting-wire.

This is a very perplexing and tedious operation, from three to five daysbeing required to effect it, according to the number of threads in thewarp. Changes in the number of warp threads per inch, that in certainstyles of goods would be very desirable are often omitted on accountofthe loss of time named above. The eX- pense of making and keeping onhand a large number of hole-boards is also an objection to the presentmode.

By our improvement we are able to make the changes above referred to, infrom one to two hours, without removing the mail cords from thelifting-wires. The frame of the hole-board A, A, Figs. I and IV, is ofsuch length as to extend across the breadth of the frame of the loom, towhich it is fastened. On each side of this frame there is a groove B, B,of suitable size to receive the bars C, C', which have upon their upperedge notches D, D, D, as shown in Figs. TI and IH. The notches of thetwo bars thus placed opposite to each other are equi-distant, andreceive the ends F, F, of the cross bars E, E, Fig. V. The ends F, arenot closely fitted to the notches D, D, but are made a little smaller,so as to allow the bars C, C to be moved a sho-rt distance endwise. Thecross-bars E, may be made of brass, or other metal and should be aboutone eighth of an inch thick. Their number, and the number of holes H, H,in each bar will depend upon the required number of warp threads in thecloth.

A screw I, Figs. I and IV holds a rib or band G, in contact with the topo-f the frame A, the breadth of this band being such as to allow it tolap over the ends of the holebars E, and confine them in place. The twoside bars that are in use have always the same number of notches to aninch, in order that the cross-bars may all be parallel with each other.Other bars are provided, in pairs, having a different number of notchesto an inch, which are inserted in the grooves B, B, when the breadth isto be altered, the mail cords P being allowed to remain in theirrespective holes in the cross bars, and hanging from the lifting wires,in their working position. If we use a pair of bars like Fig. HI, havingeleven notches, and each cross-bar having twenty holes, we have twohundred and twenty mail-cords in a breadth of siX inches. Tf wesubstitute for these a pair of bars, like Fig. II, and place the -elevencross-'bars in eleven contiguous notches, We have the same number ofmaileords in a breadth of three inches. When the side bars are insertedthey are so placed with reference to each other as to bring the backhole of one cross-bar nearly in line With the front hole of the adjacentcrossbar, as shown by the dotted line L, M, Fig. I. Any required numberof threads to the inch can thus be obtained by simply using side barshaving more or less notches to an inch. This apparatus may also be usedin dressers, Warpers and other machines, as a raddle or guide for theyarns or threads.

EDWD. EVERETT. [L s] SAMUEL T. THOMAS. [L sg Vitnesses JoNA. LADD, S. P.BRYANT.

